Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. The verb 'Get' clearly indicates a read-only operation, and the modifier 'archived standard campaign' clarifies the object's state. It does not disclose error handling, but for a simple retrieval tool, the core behavioral trait (non-mutating read) is sufficiently conveyed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.